After pulling 18.0.1 we found some dialogs we had that used a ribbon had a similar looking bug. The tab region where we had a single tab displayed black in the entire area to the right of the tab. We were calling EnableFrameTheme(FALSE). I change to send in TRUE and it "fixed" the issue. But of course, the entire look of the dialog changed to boot.

This dialog placed on the floating pane (DockingPane Object). See the icon on title bar. Title text putting under icon with all Visual Studio 2015 themes and putting correcttly with other themes. Property ...Options.ThemedFloatingFrames set to True.

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